Articles
  • Synthesis of Gd-doped CeO2 by ultrasonic spray pyrolysis with salt-assisted decomposition and its electrical and mechanical properties
  • Hee Jung Parka,*, Gyung Bok Kimb, Seng Jae Jungb, Young-In Leec, Jae-Kyo Yangd, Yun Ho Jind and Yong Ho Choab,*
  • a Department of Advanced Materials Engineering, Daejeon University, 62 Daehak-ro, Dong-gu, Daejeon 300-716, Korea b Department of Fusion Chemical Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, Korea c Department of Materials Science and Engineering, Science & Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Korea d Advanced Materials & Processing Center, Institute for Advanced Engineering, 175-28, Goan-ro 51, Baejam-myeon, Yongin-si, 449-863, Korea
Abstract
Much attention has been paid to acceptor doped-ceria as a promising solid electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs) due to its high oxygen-ion conductivity. However, poor sinterability leading to high grain boundary resistance and weak mechanical properties have limited its commercialization. In this work, ceria nanoparticles were synthesized via ultrasonic spray pyrolysis using salt-assisted decomposition (SA-USP) to enhance the sinterabililty of the ceria. The effects of the quantity of added salt on the nanoparticle-characteristics were examined. Highly dense ceria (relative density ~ 97.5%) was obtained by sintering the nanoparticles at a temperature as low as 1300 oC and its mechanical and electrical properties were investigated. The hardness and the oxygen-ion conductivity of the ceria with high density were reasonably good, ~ 14 GPa and above 10−3 S/cm at the IT-SOFC operating temperatures.

Keywords: USP, GDC, Density, Electrical property, Mechanical property.

This Article

  • 2016; 17(8): 818-824

    Published on Aug 31, 2016

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